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27 April 2024 |
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A possible evidence of observation of two mixed phases in nuclear collisions | | K.A. Bugaev
; A.I. Ivanytskyi
; V.V. Sagun
; G.M. Zinovjev
; D.R. Oliinychenko
; V.S. Trubnikov
; E.G. Nikonov
; | | Date: |
20 Nov 2015 | | Abstract: | Using an advanced version of the hadron resonance gas model we have found
several remarkable irregularities at chemical freeze-out. The most prominent of
them are two sets of highly correlated quasi-plateaus in the collision energy
dependence of the entropy per baryon, total pion number per baryon, and thermal
pion number per baryon which we found at center of mass energies 3.6-4.9 GeV
and 7.6-10 GeV. The low energy set of quasi-plateaus was predicted a long time
ago. On the basis of the generalized shock-adiabat model we demonstrate that
the low energy correlated quasi-plateaus give evidence for the anomalous
thermodynamic properties of the mixed phase at its boundary to the quark-gluon
plasma. The question is whether the high energy correlated quasi-plateaus are
also related to some kind of mixed phase. In order to answer this question we
employ the results of a systematic meta-analysis of the quality of data
description of 10 existing event generators of nucleus-nucleus collisions in
the range of center of mass collision energies from 3.1 GeV to 17.3 GeV. These
generators are divided into two groups: the first group includes the generators
which account for the quark-gluon plasma formation during nuclear collisions,
while the second group includes the generators which do not assume the
quark-gluon plasma formation in such collisions. Comparing the quality of data
description of more than a hundred of different data sets of strange hadrons by
these two groups of generators, we find two regions of the equal quality of
data description which are located at the center of mass collision energies
4.3-4.9 GeV and 10.-13.5 GeV. These two regions of equal quality of data
description we interpret as regions of the hadron-quark-gluon mixed phase
formation. | | Source: | arXiv, 1511.6698 | | Services: | Forum | Review | PDF | Favorites | |
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